Since 1985 SunPower has been leading global solar innovation. SunPower solar panels consistently deliver more energy and long-term peace of mind with the highest performing solar power systems available. SunPower is the solar energy choice of more homeowners and businesses around the world.

Current Models And Output

X21-335-BLK (335 Watt panel, All Black), X21-345, E20-327

Product Technology

Monocrystalline

Efficiency

20.4% - 21.5% Efficiency

Product warranty duration

25 Years

What's Covered in Product Warranty

SunPower Corp.'s product warranty covers defects in materials or workmanship under normal application, installations, and use and service conditions. SunPower will repair, replace, or refund the defective PV Modules within the terms listed in warranty.

Product performance warranty

At the end of 25 Years power output should be no less than 87%.

What's covered in performance warranty

SunPower Corp.'s performance warranty covers the output efficiency of your solar system. After a period of 5 (five) years output should be no less than 95%. After a period of 25 (twenty-five) years output should be no less than 87%. If output is reduced to less than 95% in 5 years or less than 87% in 25 years SunPower will repair, replace (new or refurbished) or refund the defective PV Modules.

Where Manufactured?

USA, Philippines

Corporate/Ownership Structure

Privately held; Total, S.A., owns 65% of SunPower. Total is a French multinational integrated oil and gas company and one of the six "Supermajor" oil companies in the world

I think it's clear Sunpower makes the best solar panels, but you pay a price for them. My prediction is that the technology will keep getting better, and in 10-15 years you may want to upgrade your system anyway, so why would you pay a lot for premium panels with a very long lifetime? In 15+ years, the low cost panels are likely to be more efficient, and you'll want to replace your (golden) Sunpower panels, anyway. But, if you must have the best - and cost is no object, this is the best.

I think it's clear Sunpower makes the best solar panels, but you pay a price for them. My prediction is that the technology will keep getting better, and in 10-15 years you may want to upgrade your system anyway, so why would you pay a lot for premium panels with ...